Category E Fittings
| Compressed Air filters up to 3″ dia | Atlas Copco Airpower N.V. |
| Filters and Steam Traps up to 3″ dia | Armstrong International |
| Filters up to 0.25″ dia | A+ Corporation |
| Filters up to 1/4″ dia | Swagelok Company |
| Filters up to 3″ dia | Domnick Hunter Limited |
| General Filters and Separators | Walker Filtration Ltd. |
| General Filters and Strainers | John Brooks Company Ltd. |
| General Filters up to 3 1/8″ dia | Emerson Climate Technologies Ltd. |
| General Strainers up to 16″ dia | Spence Engineering Co. |
| Separators up to 3 1/8″ dia | Temprite Company |
| Specialty Filters | Donaldson Filtration Deutschland Gmbh |
| Steam Traps and Strainers | Spirax Sarco |
| Steam Traps up to 2.5″ dia | Richards Industries |
| Steam Traps up to 3″ dia | Velan Valves Ltd. |
| Steam Traps up to 4″ dia | Watson Mcdaniel |
| Steam Traps, Filters and Separators | Tlv Co. Ltd. |
| Strainers and Steam Traps up to 2″ dia | United Brass Works Inc. |
| Basket Strainers | Titan Flow Control Inc. |
| Y-Strainers | Titan Flow Control Inc. |
| Strainers up to 16″ dia | Mueller Steam Specialty |
| Strainers up to 20″ dia | Islip Flow Controls Inc. |
| Strainers up to 20″ dia | Sure Flow Equipment |
| Strainers up to 48″ dia | Valvosider S.R.L. |
| Strainers up to 6″ dia | Hansen Technologies Corporation |
| Y Strainers up to 12″ dia | Kitz Corporation |